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An optical wavelength-division multiplexing (WDM) subscriber network architecture and an economical introduction scenario for B-ISDN services are proposed. B-ISDN services are integrated into an optical WDM subscriber network by using a different wavelength for each service. Key technologies for each of the introduction scenario's five stages are described, and some preliminary results obtained with them are presented. These technologies are (1) optical WDM subscriber lines, (2) a multichip space-division switching module, (3) time-and wavelength-division optical distribution, (4) a highthroughput ATM switching module, and (5) a time-division 52-Mb/s switching module with a throughput of 9.6 Gb/s.

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